Annealing bottom



Nov, 2o, 1923. mmm? W. RAWLEY ANNEALING BOTTOM Filed Feb. 8. 1922 Y "Hg-TOR ff' .f f Waag,

" attached to the bottom.

Patented Nov. 20, 1923.

UNITE WAYNE RAWLEY, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO BLAW-KNOX COM- PANY, 0F PITTSBURGH, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

ANNEALING BOTTOM.

Application med February s, 1922. serial No. 535,103.

To a?? whom, it may concer-n.:

Be it knou'n that I, IVAYNE RAWLEY, a citizen of the United States. residing at Pittsburgh. in the county of Allegheny and State of Pennsylvania, have. invented a new and useful Improvement in Annealing Bottoms` of which the following is a full, clear, and exact description.

M v invention relates to annealing bottoms.

Due to the high temperatures to which these structures are subjected, and also to the `great changes in temperature. they Warp. sag. and. as ordinarily constructed.. pull apart and become leaky Where the legs are This is due to many causes. y

l have devised a simple bottom which avoids these and other troubles. My bottom comprises a body member of substantially uniform u'all thickness throughout and free from external projections. To this portion is Welded any desired number of cylindrical hollow legs having, a. Wall thickness substantially equal to that of the body portion, and also having substantially the same expansion and contraction as that part of the body portion to which they are attached, under given changes of temperature. The metal of the legs is of substantially the same chemical composition as that of the'body port-ion.

By reason of my construction, the bottom is heated up as rapidly as the remainder of the box. so that the material at the bottom of the pack is subjected to the same heat treatment as the other part thereof.

My invention vvill be better understood by reference to the following description taken in connection with the accompanying' drawing forming a part hereof and in which:

Figure l is a plan view of a structure embodying my invention;

Figure 9- is section on the line II-II- of Figure l; and

Figure 3 is a perspective view of one of the legs before it is attached to the bottom.

The bottom comprises a body member l having a flat bottom portion 2 and an upstanding flange 3 extending around the same. The member 1 may be of any desirable material and of any suitable shape, but is of uniform wall thickness throughout, and free from projections external or internal. Attached to the bottom of the part 2 are legs 4. These legs are hollow, cylindrical pieces of metal having a Wall thickness substantially equal to that of the body member. The legs 4 are welded to t-he part 2 of the bottom, as shown in r igure '2.

There may be any desired number of legs on the bottom, and they may be arranged in any suitable manner, but I prefer to arrange. them substantially as shownI in Figures 1 and 2, that is to say, with the legs in line with each other longitudinally `and transversely of the bottom.

The annealing box is indicated by dotted lines 5 in Figure 2. The box may be of any suitable size and may be composed of any desirable material, but in order to get the best results the same should be constructed of a material of substantially the same Wall thickness as the bottom, and should be free from external projections 'and of uniform Wall thickness throughout. v

By reason of the fact that the material of the bottom and that of the legs are of substantially the same chemical composi' tion, both the bottom and legs have sub` stantially equal expansion (zo-efficients, and

therefore substantially the same amount of expansion and contraction due to temperature changes. There is, therefore., little or no tendency for the legs t-o break away from the bottom due to `differences in expansion and contraction.

By having the Wall thickness of the legs substantially the same as that of the bottom, the entire structure will be brought up to temperature` uniformly, thus avoiding the tendency to Warp which would be present if there Were differences in temperature throughout t-he structure. The location of the legs uniformly under the bottom prevents 1t from sa ging and thereby obviates any of thetroules such as usually result from sagging. f,

My invention has many advantages -resulting from the constructionand arrangement described, and b the use of Which the material being treate is uniformly annealed throughout the pack. The bottom has its mass uniformly distributed so that olifl'er-y I ences in tempera-ture are avoided, as a result of whlch a more efficlent and more durable bottom is secured.

therein Without departing from the spirit of my in'vention, and scope of my broader claims. The drawings are illustratiye only, and it will be obvious that the word circular as used herein may include elliptical and other generally circular shapes.

I claim:

1. An annealing bottom comprising a smooth, suitably shaped body and hollow legs thereon, said legs being of substantially lthe same chemical composltio as that of the material of the body, substantially as described. y

2. An annealing bottom comprising a suit.- ably shaped body and hollouv legs having a Wall thickness substantially equal to that of the body, said legs being welded to said body and having substantially the same chemicaly composition as the body, substantially as described.

3. An-annealing'bottom comprising a suitably shaped body and cylindrical hollow legs having `a Wall thickness substantially equal to that ot the body and being of substantially the same chemical composition as that of the body, Welded to said body, substantially as described.

4. An annealing bottom comprising a suitably shaped body ot substantially uniform wall thickness throughout and free from external projections, and hollow, cylindrical supporting legs on the bottom of said body, said legs having a wall thickness substantially equal to that of the body and having substantially the same expansion and contraction as the body with given temperature changes, substantially as described.

5. An annealing bottom, comprising a suitably shaped body of substantiallyv unit'orm Wall thickness throughout, and hollow supporting legs on said body, said legs having an expansion coeiiicient substantially equal to that of the body, substantially as described. c

In testimony 'whereof I have hereunto set .my hand.

VAYNE RAWLIJ Y. 

